Convert this C++ program into C #include #include // size of array #define MAX 100 // maximum number of threads #define MAX_THREAD 4 using namespace std; int a[] = { 1, 5, 7, 10, 12, 14, 15, 18, 20, 22, 25, 27, 30, 64, 110, 220 }; int sum[4] = { 0 }; int part = 0; void* sum_array(void* arg) { // Each thread computes sum of 1/4th of array int thread_part = part++; for (int i = thread_part * (MAX / 4); i < (thread_part + 1) * (MAX / 4); i++) sum[thread_part] += a[i]; } int main() { pthread_t threads[MAX_THREAD]; // Creating 4 threads for (int i = 0; i < MAX_THREAD; i++) pthread_create(&threads[i], NULL, sum_array, (void*)NULL); // joining 4 threads i.e. waiting for all 4 threads to complete for (int i = 0; i < MAX_THREAD; i++) pthread_join(threads[i], NULL); // adding sum of all 4 parts int total_sum = 0; for (int i = 0; i < MAX_THREAD; i++) total_sum += sum[i]; cout << "sum is " << total_sum << endl; return 0; }
Convert this C++ program into C
#include <iostream>
#include <pthread.h>
// size of array
#define MAX 100
// maximum number of threads
#define MAX_THREAD 4
using namespace std;
int a[] = { 1, 5, 7, 10, 12, 14, 15, 18, 20, 22, 25, 27, 30, 64, 110, 220 };
int sum[4] = { 0 };
int part = 0;
void* sum_array(void* arg)
{
// Each thread computes sum of 1/4th of array
int thread_part = part++;
for (int i = thread_part * (MAX / 4); i < (thread_part + 1) * (MAX / 4); i++)
sum[thread_part] += a[i];
}
int main()
{
pthread_t threads[MAX_THREAD];
// Creating 4 threads
for (int i = 0; i < MAX_THREAD; i++)
pthread_create(&threads[i], NULL, sum_array, (void*)NULL);
// joining 4 threads i.e. waiting for all 4 threads to complete
for (int i = 0; i < MAX_THREAD; i++)
pthread_join(threads[i], NULL);
// adding sum of all 4 parts
int total_sum = 0;
for (int i = 0; i < MAX_THREAD; i++)
total_sum += sum[i];
cout << "sum is " << total_sum << endl;
return 0;
}
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